ASTM D4419 Method for Measurement of Transition Temperatures of Petroleum Waxes
ASTM D4419 Standard Test Method for Measurement of Transition Temperatures of Petroleum Waxes by Differential Scanning Calorimetry (DSC)
1. Scope
1.1 This test method measures the transition temperatures of petroleum waxes, including microcrystalline waxes, by differential scanning calorimetry (DSC). These transitions may occur as a solid-solid transition or as a solid-liquid transition.
1.2 The normal operating temperature range extends from 15°C to 150°C (Note 1).
1.3 The values stated in SI units are to be regarded as the standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D87 Test Method for Melting Point of Petroleum Wax (Cooling Curve)
D1160 Test Method for Distillation of Petroleum Products at Reduced Pressures
D3418 Test Method for Transition Temperatures of Polymers by Differential Scanning Calorimetry
E472 Practice for Reporting Thermoanalytical Data
E473 Terminology Relating to Thermal Analysis
E474 Test Method for Evaluation of Temperature Scale for Differential Thermal Analysis
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 Differential Scanning Calorimetry (DSC) - A technique in which the difference in energy inputs into a substance and a reference material is measured as a function of temperature, while the substance and a reference material are subjected to a controlled temperature program. The record is the DSC curve. Two modes, power-compensation DSC and heat-flux DSC, can be distinguished depending on the method of measurement used. For additional background information refer to Practice E 472, Terminology E 473, and Test Method E 474.
